Soundstream Exact Exact 4.2 Owner's Manual page 7

DYNAMIC
Tweeter Protection Activation
TWEETER
Under high power/high volume conditions, the dynamic tweeter level control (DTLC)
LEVEL
circuit may activate. The purpose of DTLC is to prevent failure of the tweeter by
CONTROL
reducing its output when necessary. If the DTLC circuit is engaged you will notice a
decrease in high frequency output and the light bulb on the crossover board will light up
(see Figure 3). The circuit is self-resetting -- if the DTLC activates, turn the volume
down and normal operation will resume in a few minutes.
DTLC Light Bulb
FIGURE 3
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